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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* KOML.java
* Copyright (C) 2004 University of Waikato, Hamilton, New Zealand
*/
package weka.core.xml;
import weka.core.RevisionHandler;
import weka.core.RevisionUtils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
/**
* This class is a helper class for XML serialization using KOML .
* KOML does not need to be present, since the class-calls are done generically via Reflection.
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision 1.0$
*/
public class KOML
implements RevisionHandler {
/**
* indicates whether KOML
* (Koala Object Markup Language) is present
*/
protected static boolean m_Present = false;
/** the extension for KOML files (including '.') */
public final static String FILE_EXTENSION = ".koml";
/** check for KOML statically (needs only to be done once) */
static {
checkForKOML();
}
/**
* checks whether the KOML is present in the class path
*/
private static void checkForKOML() {
try {
Class.forName("fr.dyade.koala.xml.koml.KOMLSerializer");
m_Present = true;
}
catch (Exception e) {
m_Present = false;
}
}
/**
* returns whether KOML is present or not, i.e. whether the classes are in the
* classpath or not
*
* @return whether KOML is available
*/
public static boolean isPresent() {
return m_Present;
}
/**
* reads the XML-serialized object from the given file
* @param filename the file to deserialize the object from
* @return the deserialized object
* @throws Exception if something goes wrong while reading from the file
*/
public static Object read(String filename) throws Exception {
return read(new FileInputStream(filename));
}
/**
* reads the XML-serialized object from the given file
* @param file the file to deserialize the object from
* @return the deserialized object
* @throws Exception if something goes wrong while reading from the file
*/
public static Object read(File file) throws Exception {
return read(new FileInputStream(file));
}
/**
* reads the XML-serialized object from a stream
* @param stream the stream to deserialize the object from
* @return the deserialized object
* @throws Exception if something goes wrong while reading from the stream
*/
public static Object read(InputStream stream) throws Exception {
Class komlClass;
Class[] komlClassArgs;
Object[] komlArgs;
java.lang.reflect.Constructor constructor;
Object koml;
java.lang.reflect.Method methodRead;
java.lang.reflect.Method methodClose;
Class[] readArgsClasses;
Class[] closeArgsClasses;
Object[] readArgs;
Object[] closeArgs;
Object result;
result = null;
// get Deserializer
komlClass = Class.forName("fr.dyade.koala.xml.koml.KOMLDeserializer");
komlClassArgs = new Class[2];
komlClassArgs[0] = java.io.InputStream.class;
komlClassArgs[1] = Boolean.TYPE;
komlArgs = new Object[2];
komlArgs[0] = stream;
komlArgs[1] = new Boolean(false);
constructor = komlClass.getConstructor(komlClassArgs);
koml = constructor.newInstance(komlArgs);
readArgsClasses = new Class[0];
methodRead = komlClass.getMethod("readObject", readArgsClasses);
readArgs = new Object[0];
closeArgsClasses = new Class[0];
methodClose = komlClass.getMethod("close", closeArgsClasses);
closeArgs = new Object[0];
// execute it
try {
result = methodRead.invoke(koml, readArgs);
}
catch (Exception e) {
result = null;
}
finally {
methodClose.invoke(koml, closeArgs);
}
return result;
}
/**
* writes the XML-serialized object to the given file
* @param filename the file to serialize the object to
* @param o the object to write to the file
* @return whether writing was successful or not
* @throws Exception if something goes wrong while writing to the file
*/
public static boolean write(String filename, Object o) throws Exception {
return write(new FileOutputStream(filename), o);
}
/**
* write the XML-serialized object to the given file
* @param file the file to serialize the object to
* @param o the object to write to the file
* @return whether writing was successful or not
* @throws Exception if something goes wrong while writing to the file
*/
public static boolean write(File file, Object o) throws Exception {
return write(new FileOutputStream(file), o);
}
/**
* writes the XML-serialized object to a stream
* @param stream the stream to serialize the object to
* @param o the object to write to the stream
* @return whether writing was successful or not
* @throws Exception if something goes wrong while writing to the stream
*/
public static boolean write(OutputStream stream, Object o) throws Exception {
Class komlClass;
Class[] komlClassArgs;
Object[] komlArgs;
java.lang.reflect.Constructor constructor;
Object koml;
java.lang.reflect.Method methodAdd;
java.lang.reflect.Method methodClose;
Class[] addArgsClasses;
Class[] closeArgsClasses;
Object[] addArgs;
Object[] closeArgs;
boolean result;
result = false;
// get Deserializer
komlClass = Class.forName("fr.dyade.koala.xml.koml.KOMLSerializer");
komlClassArgs = new Class[2];
komlClassArgs[0] = java.io.OutputStream.class;
komlClassArgs[1] = Boolean.TYPE;
komlArgs = new Object[2];
komlArgs[0] = stream;
komlArgs[1] = new Boolean(false);
constructor = komlClass.getConstructor(komlClassArgs);
koml = constructor.newInstance(komlArgs);
addArgsClasses = new Class[1];
addArgsClasses[0] = Object.class;
methodAdd = komlClass.getMethod("addObject", addArgsClasses);
addArgs = new Object[1];
addArgs[0] = o;
closeArgsClasses = new Class[0];
methodClose = komlClass.getMethod("close", closeArgsClasses);
closeArgs = new Object[0];
// execute it
try {
methodAdd.invoke(koml, addArgs);
result = true;
}
catch (Exception e) {
result = false;
}
finally {
methodClose.invoke(koml, closeArgs);
}
return result;
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 1.4 $");
}
}
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